This preset assigns a Mix (Custom Mix in Focusrite Control) to each of the interface's analogue outputs.īy default, a Custom Mix is a combination of analogue inputs and DAW 1/2, mixed together. Zero-Latency Tracking is often a Preset in Interface Control Software. We'll use the term 'Zero-latency' to avoid confusion. The term 'Ultra-low' is used as audio interface hardware/firmware induces a negligible amount of latency. Our interfaces offer Zero, or Ultra-low, Latency tracking and Direct Monitor options to further help the issue of latency as much as possible. Have a look at our optimisation guides to help keep your computer running well:įocusrite Help Centre: Optimisation Zero/Ultra-Low Latency Tracking and Direct Monitor This is another reason to keep your computer in good order. Generally, the better a computer is, the less latency it incurs on its own, but this depends on the condition of the computer, and its load at the time. USB hubs, the performance may suffer and you may need a higher buffer size.Some computers have more, or less, latency than others.The latency that you set using your buffer size (and sample rate) is not the latency that impacts the sound by the time it reaches your ears. * These examples assume that the speed of sound in air is 343 m/s. If you're sat 1m (just over an arm's length) from your speakers then the latency between the sound from your speaker and your ear is 3.4ms*.If two people stand at the opposite ends of a bus (assuming its maximum length of 15 metres), there is a 43-millisecond delay when they speak (or shout) to each other.* The time it takes for the sound of a snare drum to reach a drummer's ears, is about 2.1 milliseconds.* To get an idea of how long one millisecond is, it's best to give some real-world examples that people are familiar with: On a PC system, the buffer size is set either in Focusrite Notifier, or the Audio Control Panel. On a Mac system, the buffer size is set in your DAW - often in the Audio section of the Preferences page (DAWs may vary). If you set your buffer size in milliseconds and not samples, then you are controlling the overall latency in time, The buffer is adjusted for each sample rate so that you always get the latency that you have set in milliseconds. At lower sample rates, there are fewer samples in a second and therefore 512 samples is a longer period of time.At higher sample rates, there are more samples per second and therefore 512 samples is a shorter period of time.The amount of time (milliseconds) 512 samples equates to, depends on how long it takes for 512 samples to be processed. Let's say you have set a buffer size of 512 samples. The higher the sample rate, the less amount of time (milliseconds) that the buffer size equates to. Depending on the interface, the buffer size is set in either samples or milliseconds.Ī buffer size that is set in samples equates to a certain amount of time, but that amount of time is dependant on the sample rate (the number of samples recorded per second). A higher buffer size creates a longer latency, a lower buffer size creates a shorter latency. To reiterate, when setting your buffer size, what you are doing in effect is giving the CPU of your computer a period of time to process audio, before it is passed to and from the interface and the recording software. You will notice when it's working too hard because there will be problems with the audio, such as crackling, stretching and dropouts. The objective is to find a buffer size that is low enough that your CPU can handle it before it has to work too hard. Higher buffer size - higher latency but more stability with the audio signal.Lower buffer size - lower latency but a higher chance of glitches/drop-outs.Using a lower buffer size (and therefore getting less latency) gives your CPU less time to process the audio and therefore the CPU must work much harder to process the audio in that amount of time. You can adjust the buffer size for your requirements. The time this takes is, in part, the buffer size, which you can set yourself. This delay is because the computer needs time to process the audio and route it back out of your interface. When you are recording audio with your interface, you might notice a slight delay in the audio coming back to you. This article explains buffer sizes and latency, including how different sample rates have an effect on them.
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